Installation Pack "A" includes: Pack No. 3, Pot Hanging cowl installation kit with 125mm flex adaptor Multi-fuel flexible liner Rigid fixed 500mm pipe Register Plates CO Alarm DETAILS Pack No. 3, Pot Hanging cowl installation kit with 125mm flex adaptor OverviewMF20 MI-FLEX Accessories is a family of installation fittings that have been perfectly designed for use with MI-FLEX 316 and 904 flexible flue liners. When fitted in conjunction together It will make a full system chimney. General ApplicationThese items are to be used in conjunction with MI-FLEX multi-fuel flexible flue liner. Building Regulations Document J requires that a flexible flue liner can only be installed completely enclosed inside a masonry chimney. A non-masonry enclosure such as timber or plasterboard boxing-in is not acceptable. All items are suitable for use on appliances up to 600°C (T600 designation). Suitable for use on Wood